On Sun, Nov 11, 2012 at 10:29:05PM +0530, Ramkumar Ramachandra wrote:

> +static int parse_submodule_params(struct diff_options *options, const char 
> *value,
> +                             struct strbuf *errmsg)
> +{
> +     if (!strcmp(value, "log"))
> +             DIFF_OPT_SET(options, SUBMODULE_LOG);
> +     else if (!strcmp(value, "short"))
> +             DIFF_OPT_CLR(options, SUBMODULE_LOG);
> +     else {
> +             strbuf_addf(errmsg, _("'%s'"), value);
> +             return 1;
> +     }
> +     return 0;
> +}

I think "-1" would be the more normal error return.

> @@ -223,6 +238,15 @@ int git_diff_basic_config(const char *var, const char 
> *value, void *cb)
>               return 0;
>       }
>  
> +     if (!strcmp(var, "diff.submodule")) {

Shouldn't this be in git_diff_ui_config so it does not affect scripts
calling plumbing?

> +             struct strbuf errmsg = STRBUF_INIT;
> +             if (parse_submodule_params(&default_diff_options, value, 
> &errmsg))
> +                     warning(_("Unknown value for 'diff.submodule' config 
> variable: %s"),
> +                             errmsg.buf);
> +             strbuf_release(&errmsg);
> +             return 0;
> +     }

Hmm. This strbuf error handling strikes me as very clunky, considering
that it does not pass any useful information out of the parse function
(it always just adds '$value' to the error string).  Wouldn't it be
simpler to just have parse_submodule_params return -1, and then let the
caller warn or generate an error as appropriate?

-Peff
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